Kevin Grosskreutz (L) battles for the ball with Mario Goetze in the German Cup final (Picture: Patrick Stollarz/AFP/Getty Images)

Germany World Cup star Kevin Grosskreutz has taken losing badly to a new level – after relieving himself in the lobby of the national team’s hotel.

A leaky defence wasn’t the only thing Grosskreutz was guilty of, according to German newspaper Bild, after drowning his sorrows in the wake of Borussia Dortmund’s 2-0 German Cup final defeat by Bayern Munich on May 17.

Eyewitnesses report that the 25-year-old urinated in the lobby of the Hotel Berlin at 6am after a boozy night out at trendy club Kraftwerk.

After that he was involved in a noisy dispute with a hotel guest and police were called but, by the time officers arrived, the player had left.

Grosskreutz has apologised for his behaviour saying: ‘I was totally frustrated after the game. We had planned so much and really wanted to win the trophy. I had a blackout. I am sorry.’

However the homegrown player, a lifelong Dortmund fan, is rapidly gaining a reputation as the bad boy of German football. Earlier this month was accused of throwing a spicy kebab into the face of a Cologne fan.

After the latest incident, Grosskreutz has been given a dressing down by German national team coach Joechim Loew and his general manager Oliver Bierhoff, although he remains a member of their 23-strong squad for this summer’s World Cup in Brazil.

‘We have had a serious talk with Kevin,’ said Loew. ‘National players are role models. We have reminded him of this and made it clear to him that such an incident should not happen again.’